There is a 12V ground wire between the 'stat and air conditioner, either end can have enough corrosion to prevent a proper connection; matter of fact that goes for all the 'stat wires, some may only carry a few millivolts.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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